Details

This requires the 5 DBs installed (mysql, postgres, mssql, sqlsrv, oracle) and testing it under 21_STABLE could be enough (patch is 100% the same in 20 and master).

1) Using PostgreSQL (skip the report against other DBs), go to "Site administration > Development > XMLDB editor > Check defaults and run the report in a brand new site (results may be different if the site is one upgrade from previous versions).
2) TEST: It returns "Wrong defaults found: 0" (before the patch it was detecting false wrong defaults (failing on negative ones)

3) Run DB functional tests against the 5 databases.
4) TEST: No failure / exception related with test_get_columns() happens (ignore any other failure).

This requires the 5 DBs installed (mysql, postgres, mssql, sqlsrv, oracle) and testing it under 21_STABLE could be enough (patch is 100% the same in 20 and master).
1) Using PostgreSQL (skip the report against other DBs), go to "Site administration > Development > XMLDB editor > Check defaults and run the report in a brand new site (results may be different if the site is one upgrade from previous versions).
2) TEST: It returns "Wrong defaults found: 0" (before the patch it was detecting false wrong defaults (failing on negative ones)
3) Run DB functional tests against the 5 databases.
4) TEST: No failure / exception related with test_get_columns() happens (ignore any other failure).